What are you waiting for? You've got work to do. Done!!!
Not with the project, but reading the whole thread! I want to arm myself with info before I heat up my soldering iron... but what the... there are two version already? Which one to build?
Hi guys, I am new here. I am glad I found this thread.... I am a Quasi follower now. Whew! I am glad that's off my chest.
So which one to build guys? 100 RMS/Channel clean amplifier is enough to turn me on. Please be gentle with me because this will be my very first time to try non-chip based amplifier. I finally gathered strength and will to build myself one.
Already, I am lost in setting up the VR1 and VR2... I can;t find in the thread where am I supposed to poke my meter's lead into.
Anyways, I guess that's enough for the "brief" introduction of me...
Go ahead guys, let's go back to the topic.
P.S.
Mr Quasi, Sir? Please send to rhavecilla@yahoo.com the materials you sent the older guys to guide me in creating my first Quasi amplifier. Thank you sir.
Not with the project, but reading the whole thread! I want to arm myself with info before I heat up my soldering iron... but what the... there are two version already? Which one to build?
Hi guys, I am new here. I am glad I found this thread.... I am a Quasi follower now. Whew! I am glad that's off my chest.
So which one to build guys? 100 RMS/Channel clean amplifier is enough to turn me on. Please be gentle with me because this will be my very first time to try non-chip based amplifier. I finally gathered strength and will to build myself one.
Already, I am lost in setting up the VR1 and VR2... I can;t find in the thread where am I supposed to poke my meter's lead into.
Anyways, I guess that's enough for the "brief" introduction of me...
Go ahead guys, let's go back to the topic.
P.S.
Mr Quasi, Sir? Please send to rhavecilla@yahoo.com the materials you sent the older guys to guide me in creating my first Quasi amplifier. Thank you sir.
Re: Done!!!
No problem Rhavecilla. I am interstate* at the moment and will be back later tonight. I'll send you an email with latest versions plus setup information.
*where I was hosted by AKSA (Hugh Dean) and his family. A magnificent meal, enjoyable music and amp discussions.
Cheers
Quasi
rhavecilla said:
No problem Rhavecilla. I am interstate* at the moment and will be back later tonight. I'll send you an email with latest versions plus setup information.
*where I was hosted by AKSA (Hugh Dean) and his family. A magnificent meal, enjoyable music and amp discussions.
Cheers
Quasi
QUASI amp
Any chance of getting this project WIKI-D? I think with condensed DIY instructions, maybe a link or three to the thread, PCB and schematic files the DIY potential for this design would be much greater. I am interested but like the rhavecilla cannot find the biasing information in the thread. Also since a few values have changed this can lead to frustration and confusion. Perhaps a power supply schematic would be in order as well...
Any chance of getting this project WIKI-D? I think with condensed DIY instructions, maybe a link or three to the thread, PCB and schematic files the DIY potential for this design would be much greater. I am interested but like the rhavecilla cannot find the biasing information in the thread. Also since a few values have changed this can lead to frustration and confusion. Perhaps a power supply schematic would be in order as well...
Hi,
John "keypunch" Males is actually pursuing this since some time now. He recently posted that some busy things got in his way and he'll need some more time to collect all the essentials out of the whole thread(s). He promised to check back with us as soon as he finds the time, and he eventually will!
Regarding the biasing, Quasi and Andrew have stated some ballpark values, but the exact standing bias current has to be determined depending on the fets you use - and their individual properties (deviation from ideal match, etc.). So it's more a biasing methodology than particular setting that would have to be wiki'd.
And just for the record, there are actually four projects going on. Don't forget the bipolar variant.
Cheers,
Sebastian.
PS: Quasi, AKSA, when can we expect the project commercially?
John "keypunch" Males is actually pursuing this since some time now. He recently posted that some busy things got in his way and he'll need some more time to collect all the essentials out of the whole thread(s). He promised to check back with us as soon as he finds the time, and he eventually will!
Regarding the biasing, Quasi and Andrew have stated some ballpark values, but the exact standing bias current has to be determined depending on the fets you use - and their individual properties (deviation from ideal match, etc.). So it's more a biasing methodology than particular setting that would have to be wiki'd.
And just for the record, there are actually four projects going on. Don't forget the bipolar variant.
Cheers,
Sebastian.
PS: Quasi, AKSA, when can we expect the project commercially?
Current Info Excluding the NMOS200
Hi,
This post is for the recent comments about those that have read the entire thread and still not sure about where and how to condense the thread information.
It is great you have taken the time to read the thread. As you are new to the thread it can take some time to digest and remember much of the excellent information in the thread.
I have taken the time to condense the thread to a set of links early January that just condenses the items directly related to the quasi amp for those wanting to hit road running to build the amp. The links I collected in Post #1316 do not cover the TO-220 or single pair NMOS200 as at the time it was not released, built or tested by anyone.
I think you will find all the information in Post #1316 required to build the "Classic" quasi 3 and 5 pair TO-247 based design. quasi's builders document covers most, if not all, of the information related to Post #1316. Due to forum attachment size limits the quasi builder guide cannot be posted as an attachment to the forum. As updated information appears on this forum that directly related to the quasi builder guide it is added to to the guide. So even if the guide could be posted to the forum some may feel it hard to find out where the current guide would have been posted.
There is one update to the links of Post #1316 I made by adding a couple pieces of information to the Power Table by quasi to simplify finding information related to part values that are different based on Output Power and Supply Rails. The supplemented table is Post #1458
Although there is much good information about power supply considerations, slow start circuits, DC Protection, heatsinking, Safe Operating Area, alternate parts, a few alternate values for specific user situations, alternate PCB designs, et al Post #1316 does not make any attempt to condense these. The reason is simple. There are many discussions, opinions and theories on these topics that often are discussed in dedicated threads and in many other threads on diyAudio. I personally would encourage anyone that feels they need more guidance on areas beyond the quasi amp module to certainly look at this thread for what has been discussed on such topics, but to also search for additional insights as well.
Many have commented the search function on diyAudio is not great and seems to often miss the very criteria one believes should have found certain results. For this thread I sometimes find it easier to show the printable version of the thread, select show all posts in thread and then use your browser to search the text of the thread for what you are looking for. It makes sense to save this version to your system so you can search it anytime you wish by loading it back into your browser. Some have suggested doing a seach of the internet adding the "diyaudio" keyword to your search criteria may be more effective than the diyAudio search function. Just be aware that any search will depend on using the "choice" keyword or some alternate keyword that might be the same or different spacing and the alternate keywords can show indirectly other possible keywords you may find helpful a well. Some examples of different keywords for same item are "DC Protection", DC Protect" "AMP Protection" "Protection", "SOA", "Safe Operating Area", "S.O.A.", et al.
I am also working on a link collection for specifications and with the NMOS200 out and some other added (not changed) information since Post #1316 I also need to update Post #1316 as well. That said Post #1316 is for all intents current.
Some have commented on a Wiki. I think one needs to be careful to ensure such a Wiki stays focused and on topic. Personally I see a Wiki as just a forum of a bit different functionality. Certainly a Wiki allows a place where the "current" information is kept. The risk is the Wiki will fragment the information for the quasi amplifier between this forum and the Wiki, which in my opinion is not helpful. There would be two sources to look at, likley repeated discussions, which all diyAudio threads have, that would only decrease the ability of one to find the information they wish. For sure a Wiki to keep the current links and classify the different elements of discussions this thread has had would be great. Just be aware I put a few links to keep points in this thread and over time those links were no longer valid. It seems the links to specific postings changes over time and that these only are updated within diyAudio only. So it appears the direct links to posts or attachments stays same until you put such links externally to diyAudio. This would mean any information in this thread would need to be re-entered in the Wiki even for the basics of curent information about the amp modules themselves, let alone the related information to the amp module.
I have had a few more unexpected matters arise again. I am not able to be attentive as I wish to completeing and updating the links collection and I am not sure when I can resume from the notes I have thus far.
Regards,
John L. Males
Willowdale, Ontario
Canada
06 March 2007 10:59
06 March 2007 11:04 Added Bolding to URL linked text to make clearer text is a link.
Hi,
This post is for the recent comments about those that have read the entire thread and still not sure about where and how to condense the thread information.
It is great you have taken the time to read the thread. As you are new to the thread it can take some time to digest and remember much of the excellent information in the thread.
I have taken the time to condense the thread to a set of links early January that just condenses the items directly related to the quasi amp for those wanting to hit road running to build the amp. The links I collected in Post #1316 do not cover the TO-220 or single pair NMOS200 as at the time it was not released, built or tested by anyone.
I think you will find all the information in Post #1316 required to build the "Classic" quasi 3 and 5 pair TO-247 based design. quasi's builders document covers most, if not all, of the information related to Post #1316. Due to forum attachment size limits the quasi builder guide cannot be posted as an attachment to the forum. As updated information appears on this forum that directly related to the quasi builder guide it is added to to the guide. So even if the guide could be posted to the forum some may feel it hard to find out where the current guide would have been posted.
There is one update to the links of Post #1316 I made by adding a couple pieces of information to the Power Table by quasi to simplify finding information related to part values that are different based on Output Power and Supply Rails. The supplemented table is Post #1458
Although there is much good information about power supply considerations, slow start circuits, DC Protection, heatsinking, Safe Operating Area, alternate parts, a few alternate values for specific user situations, alternate PCB designs, et al Post #1316 does not make any attempt to condense these. The reason is simple. There are many discussions, opinions and theories on these topics that often are discussed in dedicated threads and in many other threads on diyAudio. I personally would encourage anyone that feels they need more guidance on areas beyond the quasi amp module to certainly look at this thread for what has been discussed on such topics, but to also search for additional insights as well.
Many have commented the search function on diyAudio is not great and seems to often miss the very criteria one believes should have found certain results. For this thread I sometimes find it easier to show the printable version of the thread, select show all posts in thread and then use your browser to search the text of the thread for what you are looking for. It makes sense to save this version to your system so you can search it anytime you wish by loading it back into your browser. Some have suggested doing a seach of the internet adding the "diyaudio" keyword to your search criteria may be more effective than the diyAudio search function. Just be aware that any search will depend on using the "choice" keyword or some alternate keyword that might be the same or different spacing and the alternate keywords can show indirectly other possible keywords you may find helpful a well. Some examples of different keywords for same item are "DC Protection", DC Protect" "AMP Protection" "Protection", "SOA", "Safe Operating Area", "S.O.A.", et al.
I am also working on a link collection for specifications and with the NMOS200 out and some other added (not changed) information since Post #1316 I also need to update Post #1316 as well. That said Post #1316 is for all intents current.
Some have commented on a Wiki. I think one needs to be careful to ensure such a Wiki stays focused and on topic. Personally I see a Wiki as just a forum of a bit different functionality. Certainly a Wiki allows a place where the "current" information is kept. The risk is the Wiki will fragment the information for the quasi amplifier between this forum and the Wiki, which in my opinion is not helpful. There would be two sources to look at, likley repeated discussions, which all diyAudio threads have, that would only decrease the ability of one to find the information they wish. For sure a Wiki to keep the current links and classify the different elements of discussions this thread has had would be great. Just be aware I put a few links to keep points in this thread and over time those links were no longer valid. It seems the links to specific postings changes over time and that these only are updated within diyAudio only. So it appears the direct links to posts or attachments stays same until you put such links externally to diyAudio. This would mean any information in this thread would need to be re-entered in the Wiki even for the basics of curent information about the amp modules themselves, let alone the related information to the amp module.
I have had a few more unexpected matters arise again. I am not able to be attentive as I wish to completeing and updating the links collection and I am not sure when I can resume from the notes I have thus far.
Regards,
John L. Males
Willowdale, Ontario
Canada
06 March 2007 10:59
06 March 2007 11:04 Added Bolding to URL linked text to make clearer text is a link.
Seb,
Thank you for your question - it raises interesting points.
Quasi has a full on day job, at which he is highly expert and well paid. Amps are his hobby. I have no such job, and amps are my livelihood, so I sell my work professionally. In past years there have been many opportunities for contiributing on this forum, but I've pulled back in recent years because I have little spare time and I don't want to distribute my sonic secrets since they are, in fact, my living. This is not to say I'm not interested in the work of others, however, and I enjoyed a marvellous chat and a good meal with Quasi last Sunday night when he came to Melbourne for a work conference.
I have two commercial amp designs, the AKSA and the Lifeforce, and a few other products, and while I appreciate Quasi's design as very, very good I choose for obvious reasons to sell my own! This is no slur on his amp, believe me. There are a few things I'd probably do differently, and vice versa, but that's just part of life's rich tapestry and I feel his amp is a magnificent performer!
Cheers,
Hugh
Thank you for your question - it raises interesting points.
Quasi has a full on day job, at which he is highly expert and well paid. Amps are his hobby. I have no such job, and amps are my livelihood, so I sell my work professionally. In past years there have been many opportunities for contiributing on this forum, but I've pulled back in recent years because I have little spare time and I don't want to distribute my sonic secrets since they are, in fact, my living. This is not to say I'm not interested in the work of others, however, and I enjoyed a marvellous chat and a good meal with Quasi last Sunday night when he came to Melbourne for a work conference.
I have two commercial amp designs, the AKSA and the Lifeforce, and a few other products, and while I appreciate Quasi's design as very, very good I choose for obvious reasons to sell my own! This is no slur on his amp, believe me. There are a few things I'd probably do differently, and vice versa, but that's just part of life's rich tapestry and I feel his amp is a magnificent performer!
Cheers,
Hugh
Quaksa (or Quasi meets AKSA)
http://www.diyaudio.com/forums/showthread.php?postid=1151912#post1151912
http://www.diyaudio.com/forums/showthread.php?postid=1151912#post1151912
sek said:Hi,
PS: Quasi, AKSA, when can we expect the project commercially?
Hi Sebastian,
The Nmos designs in this thread are intended to be freely available to electronics / audio enthusiasts. As Hugh mentions I am a hobbyist and treat my activity as such. I do not have a desire to commercialise this amp and indeed would be dissappointed to learn that someone was making money from it. The purpose of this project is to allow people who because of circumstance or choice would rather build their own from the ground up.
As Hugh also described we agree on many things, and we also do some things differently. After all Hugh designs outstanding amplifiers that sell on the merits of their performance. He continously strives for perfection (and even that is different for different people) as a full time obsession. I on the other hand am a hobbyist with a day job, less resources and indeed time. In any case if you look at the photo linked here http://www.diyaudio.com/forums/show...912#post1151912 you'll see we are quite different.
Cheers
Q
What about this one?
http://www.diyaudio.com/forums/showthread.php?postid=1151912#post1151912
Cheers
Q
http://www.diyaudio.com/forums/showthread.php?postid=1151912#post1151912
Cheers
Q
Oh! I am thrilled as I download the attachment Mr. Quasi sir.
This Sunday, I will start my parts purchase and scavenging. I will be using a E-I core based transformer as Toroid Transformer with 800VA rating here costs 5,000.00 Pesos (aprox. 100.00 U$). And if I can't find an available off-the-shelf transformer, I might have to deal with made-to-order one.
Wish me luck guys, imma take this nice and slow and enjoy the fume of burning flux. Isn't that a passion or what?
But I will check this thread often for a possibility of breaking news.
This Sunday, I will start my parts purchase and scavenging. I will be using a E-I core based transformer as Toroid Transformer with 800VA rating here costs 5,000.00 Pesos (aprox. 100.00 U$). And if I can't find an available off-the-shelf transformer, I might have to deal with made-to-order one.
Wish me luck guys, imma take this nice and slow and enjoy the fume of burning flux. Isn't that a passion or what?
But I will check this thread often for a possibility of breaking news.
quasi said:
Baskiria,
Check this post, you'll find there everything: schema, PCB, etc...
http://www.diyaudio.com/forums/showthread.php?postid=1103559#post1103559
Check this post, you'll find there everything: schema, PCB, etc...
http://www.diyaudio.com/forums/showthread.php?postid=1103559#post1103559